What are the potential pitfalls of sending emails to non-existent email addresses in PHP?

Sending emails to non-existent email addresses in PHP can lead to bounce-back emails, which can negatively impact your sender reputation and deliverability rates. To avoid this issue, you can implement email validation before sending the email to ensure that the recipient's email address is valid. 

// Check if the email address is valid before sending the email
$email = 'nonexistent@example.com';

if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Send email
    mail($email, 'Subject', 'Message');
} else {
    echo 'Invalid email address';
}

Keywords

email validation SMTP server bounce handling error handling email verification

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